In this lesson I explained why I only recommend using shows, illustrates and compares in your task 1 introduction. There are plenty of other synonyms for the word "shows", but almost all of them will look strange in the context of a description of a graph or chart.
One other possibility that I also occasionally use is the phrase "gives information about". Look at the introduction below, for example.
Click here to see the task. Here's my introduction:
The bar chart and pie chart give information about why US residents travelled and what travel problems they experienced in the year 2009.
The bar chart illustrates the reasons why US citizens travelled in 2009, whilst the pie chart compares the encountered problems related with the travelling in the same year.
Posted by: sara | August 10, 2017 at 09:50
sara
https://www.google.co.nz/search?q=%22the+problems+encountered%22&lr=lang_en&gbv=1&tbs=lr:lang_1en&tbm=bks&ei=Z_KMWeaSG4GY8wW6zIbIBA&start=30&sa=N
like:
"the people involved"
"the information provided"
Posted by: Oleg | August 11, 2017 at 00:59
The bar chart illustrates why US citizens travelled and major problems they experienced with public transportation in 2009.
Thanks Simon.
Posted by: MT | August 11, 2017 at 03:09
The bar chart and pie chart reveal why US residents travelled and the problems they experienced in 2009.
'Reveal' is ok ?
Posted by: Jason Hu | August 14, 2017 at 09:56
your explanations are quite helpful to us. thank u for your effort.
Posted by: carol | September 06, 2017 at 03:52
These are a bar chart and pie chart illustrate the reasons for travelling and the major concerns about travelling, respectively, among american travellers in year 2009
Posted by: Joe | September 13, 2017 at 11:44